This stamp commemorates the death of Mendeleev (February 1907), one of the lead figures responsible for the periodic table. Absolutely excellent choice of colours if I might say so!
The stamp was sent to me by Prof Gabriel Pinto (Departamento de Ingeniería Química Industrial, ETSI Industriales, UPM, Madrid, Spain) and I quote from his web page: “This stamp was launched on february 2, 2007, by Correos (Spanish Post Office).
WebElements February 2nd, 2007
Posted In: Chemistry
“On the Arc Spectrum of Scandium”, Published by William Crookes in the Proceedings of the Royal Society of London, Series A1
This article was published in 1918 by William Crookes and is made available by The Royal Society because of its great historical significance. It makes interesting reading. It shows photographs of the experimental data.
WebElements June 4th, 1919